A rotary bending fixture for tungsten wire strength testing

Abstract

The utility model discloses a kind of rotary bending clamps for tungsten wire strength test, more specifically in tungsten wire strength test technical field, including base, the left and right two parts of base upper end are fixedly connected with sliding device, protractor is fixedly connected with the base upper end front part, a group of rotating device is installed in two the sliding device upper end, two The fixed device is installed on the sliding device, two The fixed device is located between each group The rotating device, several clamps are installed on two The fixed device. The rotary bending clamp for tungsten wire strength test, by the mechanical linkage combination of protractor and other devices, the micro-bending control of tungsten wire is realized, tungsten wire is accurately triggered to break;While multiple sample parallel test can be completed by single operation, the connection design of each device component is reasonable, the stability and safety of testing process are ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of tungsten wire strength testing, and in particular to a rotary bending fixture for tungsten wire strength testing. Background Technology

[0002] Tungsten filaments, due to their high melting point, excellent high-temperature strength, and stable conductivity, are widely used in critical fields such as incandescent lamp filaments, high-temperature thermocouples, aerospace engine ignition electrodes, and nuclear industry detectors. In these applications, tungsten filaments are often subjected to high-frequency vibration, periodic bending, or rotational stress, such as the thermal vibration of filaments under alternating current and the reciprocating bending of electrodes in rotating mechanisms. Their fatigue strength and bending fracture resistance directly determine the product's lifespan and safety.

[0003] Therefore, simulating the actual stress environment of tungsten wires through rotational bending tests and determining parameters such as fatigue limit and fracture life under bending loads is a key step in the quality control of tungsten wire production and the verification of its application reliability. Utility Model Content

[0004] The main objective of this invention is to provide a rotary bending fixture for testing the strength of tungsten wires, which can effectively solve the problems mentioned above.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A rotary bending fixture for testing the strength of tungsten wire includes a base. Sliding devices are fixedly connected to the left and right sides of the upper end of the base. A protractor is fixedly connected to the front of the upper end of the base. A set of rotating devices is installed on the upper end of each of the two sliding devices. Fixing devices are installed on each of the two sliding devices. The two fixing devices are located between each set of rotating devices. Several clamps are installed on each of the two fixing devices.

[0006] Preferably, the sliding device includes two sliding bases, each of which is slidably connected to a slider. Each of the two sliders has a handle threadedly connected to the side away from each other, and a metal plate is fixedly connected to the side of the two sliders that are close to each other.

[0007] Preferably, the rotating device includes two racks, the tooth surfaces of the two racks meshing with gears, and the lower parts of the two racks are respectively fixedly connected to the upper sides of the two sliding bases.

[0008] Preferably, the fixing device includes two upright plates, the lower parts of the two upright plates are fixedly connected to the first metal plate, and the two upright plates are rotatably connected to metal rods. One side of each of the two metal rods passes through the two upright plates and is connected to two gears respectively. The other side of the two metal rods is rotatably connected to a second metal plate, and the upper end of the second metal plate is fixedly connected to several mounting plates, each of which is equipped with a clamp.

[0009] Preferably, the clamp includes a button, the right side of which is threaded to an inner cylinder, an outer cylinder is sleeved on the outside of the inner cylinder, a clamping cylinder is sleeved inside the inner cylinder, a conical barrel is threaded to one end of the outer cylinder, a tungsten wire is clamped in the inner cavity of the clamping cylinder, and one side of the tungsten wire extends to the outside of the conical barrel.

[0010] Preferably, the inner cylinder includes a first cylindrical cylinder, a spring is fixedly connected to the right side of the first cylindrical cylinder, a second cylindrical cylinder is fixedly connected to the right side of the spring, and the clamping cylinder is located inside the first cylindrical cylinder, the spring, and the second cylindrical cylinder, with its opening extending to the outside of the second cylindrical cylinder.

[0011] Preferably, the outer cylinder has a circular protrusion inside, located at the connection between the button and the inner cylinder, which can prevent the inner cylinder from moving outward.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This device uses a designed clamping cylinder to generate uniform radial pressure under an elastic clamping mechanism, avoiding the stress concentration that can cause breakage in traditional rigid clamps. At the same time, the conical barrel guides the tungsten wire to be inserted precisely without any tool scraping, ensuring surface integrity. It is especially suitable for tungsten wires with smaller diameters.

[0013] This device, through the combined action of a designed rotating and fixing mechanism, can drive the fixture to rotate. With the protractor on the base, the rotation angle can be accurately observed, thus meeting the strength testing requirements of tungsten wire at different bending angles.

[0014] This device, through the design of several proportionally sized clamps, can simultaneously test tungsten wires of different diameters, reducing the tedious process of multiple measurements and improving testing efficiency, making it particularly suitable for batch testing scenarios. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the connection relationship between the sliding device, rotating device, fixing device, and clamp of this utility model; Figure 3 This is a cross-sectional schematic diagram of the internal structure of the clamp of this utility model; Figure 4This is a cross-sectional view of the internal structure of the clamp of this utility model from another perspective; Figure 5 This is a schematic diagram of the inner cylinder structure of this utility model; Figure 6 This is a schematic diagram showing the connection between the clamp and the tungsten wire of this utility model; Figure 7 This is a schematic diagram of the button structure of this utility model.

[0016] In the diagram: 1. Base; 2. Protractor; 3. Sliding device; 31. Sliding base; 32. Slider; 33. Handle; 34. Metal plate one; 4. Rotating device; 41. Rack; 42. Gear; 5. Fixing device; 51. Metal rod; 52. Vertical plate; 53. Metal plate two; 54. Mounting plate; 6. Clamp; 61. Button; 62. Outer cylinder; 63. Inner cylinder; 631. Cylindrical cylinder one; 632. Spring; 633. Cylindrical cylinder two; 64. Clamping cylinder; 65. Conical barrel; 66. Tungsten wire. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] Example 1, as Figure 1 As shown, a rotary bending fixture for testing the strength of tungsten wire includes a base 1. Sliding devices 3 are fixedly connected to the left and right sides of the upper end of the base 1. A protractor 2 is fixedly connected to the front of the upper end of the base 1. A set of rotating devices 4 is installed on the upper end of each of the two sliding devices 3. Fixing devices 5 are installed on each of the two sliding devices 3. The two fixing devices 5 are located between each set of rotating devices 4. Several clamps 6 are installed on each of the two fixing devices 5.

[0019] Furthermore, such as Figure 3 As shown, the clamp 6 includes a button 61, with an inner cylinder 63 threadedly connected to the right side of the button 61. When the button 61 is pressed, the inner cylinder 63 is squeezed and moved forward. An outer cylinder 62 is fitted around the inner cylinder 63 and is fixedly connected to the mounting plate 54. A clamping cylinder 64 is fitted inside the inner cylinder 63. The clamping cylinder 64 is supported by an elastic alloy material and has an opening on one side. The diameter of the opening is larger than the diameter of the cylindrical part without an opening, and the diameter of the opening gradually increases from the beginning of the opening to the end on one side. In the initial state, the opening of the clamping cylinder 64 is bound by the inner cylinder 63. When a conical barrel 65 is threadedly connected to one end of the outer cylinder 62, there is a circular protrusion inside the conical barrel 65 to prevent the inner cylinder 63 from moving forward continuously when squeezed. A tungsten wire 66 is clamped in the inner cavity of the clamping cylinder 64, and one side of the tungsten wire 66 extends to the outside of the conical barrel 65.

[0020] Furthermore, such as Figure 5 and Figure 6 As shown, the inner cylinder 63 includes a first cylindrical cylinder 631, a spring 632 is fixedly connected to the right side of the first cylindrical cylinder 631, a second cylindrical cylinder 633 is fixedly connected to the right side of the spring 632, and a clamping cylinder 64 is located inside the first cylindrical cylinder 631, the spring 632, and the second cylindrical cylinder 633, with its opening extending to the outside of the second cylindrical cylinder 633.

[0021] Specifically, when button 61 is pressed, cylindrical tube 1 631 is squeezed forward and compresses spring 632. When the compression continues, spring 632 will transmit the compressive force to cylindrical tube 2 633. Cylindrical tube 2 633 is blocked by conical barrel 65 and cannot move forward. At this time, clamping tube 64, which is fitted inside the inner tube 63, will protrude from the outer edge of cylindrical tube 2 633. At this time, the opening of clamping tube 64 will open without the binding force of cylindrical tube 2 633. At this time, tungsten wire 66 can be inserted from the entrance of conical barrel 65 and passed into clamping tube 64. When button 61 is released, spring 632 rebounds, and all parts of the inner tube 63, including cylindrical tube 1 631, spring 632, and cylindrical tube 2 633, return to their initial positions. Cylindrical tube 2 633 will give clamping force to clamping tube 64 and drive it back to its initial position. At this time, tungsten wire 66 is firmly clamped by clamping tube 64, which meets the requirements of bending test.

[0022] For further details, please refer to [link / reference]. Figure 3 , Figure 4 and Figure 7 In order to prevent the inner cylinder 63 from flying out of the outer cylinder 62 due to the elastic force of the spring 632 when the button 61 returns to its original position, there is a circular protrusion inside the outer cylinder 62, located at the connection position between the button 61 and the inner cylinder 63, which can prevent the inner cylinder 63 from moving outward.

[0023] In summary, during implementation, the initial state of the clamping cylinder 64 is closed, bound by the cylindrical tube 633 of the inner cylinder 63. When the clamping operation is performed (pressing button 61), the cylindrical tube 631 compresses the spring 632, transmitting the elastic force to the cylindrical tube 633. The cylindrical tube 633 is blocked by the protrusion inside the conical barrel 65, preventing it from moving forward, causing the open end of the clamping cylinder 64 to extend beyond the outer edge of the cylindrical tube 633. At this point, the clamping cylinder 64 opens due to elastic recovery, and the operator inserts the tungsten wire 66 into the inner cavity of the clamping cylinder 64 through the inlet of the conical barrel 65. After releasing button 61, the spring 632 rebounds, causing the inner cylinder 63 to reset, and the cylindrical tube 633 re-encloses the open end of the clamping cylinder 64, applying a radial binding force to contract it, thus firmly clamping the tungsten wire 66. The circular protrusion inside the outer cylinder 62 prevents excessive outward movement of the inner cylinder 63, ensuring component stability. One end of the tungsten wire 66 extends to the outside of the conical barrel 65 and is held by the clamp 6 located on the other side of the base 1, with the exposed part in the middle meeting the length requirements for bending.

[0024] Example 2, this example is based on Example 1, see below. Figure 2 The sliding device 3 includes two sliding bases 31, each of which is slidably connected to a slider 32. The two sliders 32 are threadedly connected to a handle 33 on the side away from each other. The two sliders 32 are fixedly connected to a metal plate 34 on the side close to each other. The metal plate 34 is integrated with the two sliders 32. When the handle 33 is pulled, the metal plate 34 moves simultaneously with the two sliders 32. At the same time, baffles are provided on both sides of the two sliding bases 31 to ensure that the two sliders 32 are not moved out of the range of the two sliding bases 31.

[0025] For further information, please refer to [link / reference]. Figure 2 The rotating device 4 includes two racks 41, the tooth surfaces of which mesh with gears 42. The lower parts of the two racks 41 are fixedly connected to the upper sides of the two sliding bases 31 respectively. Both racks 41 are Z-shaped and contact the upper part of the slider 32 to ensure that the slider 32 moves smoothly on the sliding base 31.

[0026] For further information, please refer to [link / reference]. Figure 2 The fixing device 5 includes two upright plates 52. The lower parts of the two upright plates 52 are fixedly connected to metal plate 34. Metal rods 51 are rotatably connected to both upright plates 52. One side of each metal rod 51 passes through the two upright plates 52 and is connected to two gears 42. The other side of each metal rod 51 is rotatably connected to metal plate 53. Several mounting plates 54 are fixedly connected to the upper end of metal plate 53. Clamps 6 are mounted on each of the mounting plates 54. The sizes of the clamps 6 are proportional and can be installed from left to right or from right to left according to industry practice and individual preference, forming a row of proportionally sized clamp arrays 6. That is, when metal plate 34 moves, the upright plates 52 will drive the entire fixing device 5 to move.

[0027] Specifically, when the slider 32 is moved towards the middle position between the two sliding devices 3 by the handle 33, the metal plate 34 fixed between the two sliders 32 will also move with the slider 32. At this time, the vertical plate 52 installed on the upper part of the metal plate 34 moves synchronously with it. Due to the rotational connection between the gear 42 and the vertical plate 52, the gear 42 rotates along the rack 41 and drives the metal plate 53, which has a rotational relationship with it, to rotate. At this time, the mounting plate 54 located on the metal plate 53 will also drive the clamp 6 to rotate; see reference Figure 1 As shown, by operating the two sliding devices 3 simultaneously by using the handle 33, several proportionally sized clamps 6 on both sides of the base 1 will rotate. At this time, the operator can observe the rotation angle of the clamps 6 using the protractor 2, or install relevant infrared sensors for measurement.

[0028] Since the tungsten wire 66 is brittle at room temperature, the critical angle at which it breaks when bent is small. Therefore, when the clamp 6 rotates, it can fully meet the rotation angle required to break the tungsten wire 66 at room temperature.

[0029] Furthermore, due to the presence of several proportionally sized clamps 6 on the metal plate 2 53, tungsten wires 66 of different thicknesses, i.e. different diameters, can be measured simultaneously, reducing the tediousness of multiple measurements.

[0030] In summary, in this embodiment, rotating the handles 33 of the two sliding devices 3 drives the slider 32 to move horizontally along the sliding base 31, adjusting the distance between them. The slider 32, through the metal plate 34, synchronously moves the fixing device 5 towards the center or sides of the base 1, thereby adjusting the spacing of the two sets of clamp arrays 6 to accommodate tungsten wires 66 of different lengths. When the slider 32 moves, the rack 41 fixed on the sliding base 31 moves accordingly. The gear 42 rolls along the rack 41, transmitting the rotational motion to the metal plate 53 through the metal rod 51. The metal plate 53 drives the mounting plate 54 and the clamps 6 to rotate around the axis of the metal rod 51, causing the clamped tungsten wires 66 to bend. The operator can observe the rotation angle of the clamps 6 in real time through the protractor 2 at the front of the base 1, or record the precise bending arc using an external sensor. The proportionally arranged clamps 6 on the metal plate 53 can simultaneously clamp tungsten wires 66 of different diameters. When the sliding device 3 is activated, all clamps 6 rotate synchronously at the same angle, enabling parallel testing of multiple samples under uniform bending conditions, significantly improving efficiency. Brittle fracture triggering: Due to the extremely high brittleness of tungsten wire 66 at room temperature, even slight bending can induce fracture under the rotation of clamps 6, meeting the requirements for strength testing.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rotary bending fixture for testing the strength of tungsten wire, comprising a base (1), characterized in that: The upper left and right sides of the base (1) are fixedly connected to sliding devices (3), and the front of the upper end of the base (1) is fixedly connected to a protractor (2). A set of rotating devices (4) is installed on the upper end of each of the two sliding devices (3). A fixing device (5) is installed on each of the two sliding devices (3). The two fixing devices (5) are located between each set of rotating devices (4). Several clamps (6) are installed on each of the two fixing devices (5).

2. The rotary bending fixture for testing the strength of tungsten wire according to claim 1, characterized in that: The sliding device (3) includes two sliding bases (31), each of which is slidably connected to a slider (32). Each of the two sliders (32) is threadedly connected to a handle (33) on the side away from each other, and a metal plate (34) is fixedly connected to the side of the two sliders (32) that is close to each other.

3. The rotary bending fixture for testing the strength of tungsten wire according to claim 2, characterized in that: The rotating device (4) includes two racks (41), the tooth surfaces of the two racks (41) are meshed with gears (42), and the lower parts of the two racks (41) are fixedly connected to the upper sides of the two sliding bases (31).

4. The rotary bending fixture for testing the strength of tungsten wire according to claim 3, characterized in that: The fixing device (5) includes two upright plates (52). The lower part of the two upright plates (52) is fixedly connected to the metal plate one (34). Both upright plates (52) are rotatably connected to metal rods (51). One side of each of the two metal rods (51) passes through the two upright plates (52) and is connected to two gears (42). The other side of each of the two metal rods (51) is rotatably connected to a metal plate two (53). Several mounting plates (54) are fixedly connected to the upper end of the metal plate two (53). Clamps (6) are installed on each of the several mounting plates (54).

5. The rotary bending fixture for testing the strength of tungsten wire according to claim 1, characterized in that: The clamp (6) includes a button (61), the right side of which is threaded to an inner cylinder (63), an outer cylinder (62) is sleeved on the outside of the inner cylinder (63), a clamping cylinder (64) is sleeved inside the inner cylinder (63), a conical barrel (65) is threaded to one end of the outer cylinder (62), a tungsten wire (66) is clamped in the inner cavity of the clamping cylinder (64), and one side of the tungsten wire (66) extends to the outside of the conical barrel (65).

6. A rotary bending fixture for testing the strength of tungsten wire according to claim 5, characterized in that: The inner cylinder (63) includes a first cylindrical cylinder (631), a spring (632) is fixedly connected to the right side of the first cylindrical cylinder (631), a second cylindrical cylinder (633) is fixedly connected to the right side of the spring (632), and the clamping cylinder (64) is located inside the first cylindrical cylinder (631), the spring (632) and the second cylindrical cylinder (633), with its opening extending to the outside of the second cylindrical cylinder (633).

7. A rotary bending fixture for testing the strength of tungsten wire according to claim 6, characterized in that: The outer cylinder (62) has a circular protrusion inside, located at the connection between the button (61) and the inner cylinder (63), which can prevent the inner cylinder (63) from moving outward.

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